Type-writing machine.



L. s. BURBIDGBDEC'D.

r. 0. BURRlD GE. EXECUTOR.

TYPE WRITING MACHINE.

APPLICATION man SEPT. 25. 1915.

Patented Mar. 11.1919.

5 SHEETS-SHEET WITNESSES: l/VVE/VfOR WW d: M WWW, 2; @4

L. S. BURRQ DGE, DECD.

F- 0. BURRIDGE. EXECUTOR- TYPE WRITING MACHINE.

APPLICATION FIL'ED SEPT. 2's.'191s.

' Patented Mar.'11-,1919.

L. S. BURRIDGE. DECD. r. o. BURRIDGE, EXECLITOR.

TYPE WRITING MACHINE.

APPLICATION FILED SEPT. 25. ms.

Patented Mar. 11,1919.

s SHEETS-SHEET 3.

L. S. BURRIDGE. DEC'D.

r. 0. BURRlDGE. EXECUTOR.

TYP E wumwa MACHINE.

APPLICATION FILED SEPT. 25. I915.

Patented Mai. 11,1919.

'5 SHEETS-SHEET 4- ,nvmvm I f &

I I WITNESSES:-

L. s. BURRIDGE, 050%) F. 0. BURRIDGE, EXECUTOR.

TYPE WRITING MACHINE. f APPLICATION FILED SEPT. 25. I915.

Patented Mar. 11 1919.

s SHEETS-SHEET 5.

WITNESSES! I UNITED STATES PATENT oEErcE.

LEE s. BUEEineE, DECEASED, LATE OF NEW YORK, 'N. Y.-,-BYVFRANCIS o.BUEEIDGE, I

EXECUTOR, OF NEW YORK, N. Y.,'ASSIGNOR, BY MESNE ASSIGNMENTS, TO UNDER-WOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARETYPE-WRITING MACHINE.

To all whom it may concern:

Be it known that LE S. BORRIDGE, deceased, late a citizen of the UnitedStates, and late residing in the borough of Man hattan, county, city,and State of. New York, invented certain new and useful Improvements inT ype-VVriting Machines, ,of which the following is a specification.

The present invention relates to typewriting machines. In certain of itsfeatures, it particularly relates to machines in which the platen isshiftable from one to another case-position. The invention in many ofits features, however, is not so limited, and may be used in connectonwith machines of quite a different character. It is especiallyapplicable and useful where lightness, compactness, and cheapness ofmanufacture are important considerations.

One object of the invention is a machine, the frame-work and many otherparts of which may be of sheet metal, readily stamped to form, easilyassembled, strong,

compact, and durable, and of such size and weight as to be portable bythe operator in a small hand case; all without sacrifice of eificiencyor of equipment for performing the usual functions of a typewritingmachine.

Another object of the invention is to provide a novel and simplecase-shift in which a frame, on which the platen has letter-feed andreturn" movement, is shifted substantially rectiline'arly, as a whole,between case-positions on the main frame; also a novel mechanism foreffecting the shift,nand for holding the shiftable frame, and forguiding the same during the shift: ing operation; and means whereby thecasepositions may be accurately determined, and adjusted wheneverdesirable; and mechanism for locking the shiftable frame in anycase-position to which it may have been thrown. Preferably there arethree case; positions, and a feature of the invention is a mechanism forsetting the machine to arrest the shiftable platen frame in a middlecaseposition; and for efiectin g this setting automatically upon operationof a key by means. of which the platen frame is thrown to suchmiddle-case position.

In a preferred form of the invention em- Speeificat ion of LettersPatent.

- feed Patented Mar. 11 1919.

Application filed September 25, 1915. Serial No. 52,594.

. bodying the foregoing features of the caseshift, the platen frame ismovable up and down on the main frame, all parts of the platen framehaving substantially thesame amount of movement. For controlling thismovement, and for'holding the platen frame, there is provided a set'oflinks at the side of the machine, each of these links being pivotallyconnected atone end to a rear part of the main frame, and at the otherend to a forward part of the platen frame. The shift is primarilyeffected by key levers which engage the platen frame substantiallycentrally of the front and rear thereof, and the key action is lightenedby springs which in part counteract the weight of the platen frame.Stops in the form of nuts adjustable on studs carried by the main frame,and cooperating with lugs fixed on the platen frame, determine thecase-positions and provide for readjustment of the same when desired.The stop for middle-case position is normally in ineffective position,but a connection from the middle-case key lever automatically sets themiddle-case stop when the -middle-case shift key is operated to parts onthe main frame in all case-positions of the platen frame, and during theshifting operations.

Other features of the invention are, a novel letter-feed escapementmechamsm'; a

back-spacing mechanism; a paper guide and roller support, and mechanismfor shifting the same to and from the platen; an adjustable, marginalpaper finger, and means for setting and shifting the same; a marginalarm; and certain combinations of these various mechanisms.

Other features and advantages will hereinafter appear.

In the, accompanyingdrawings,

Figure 1 is a top plan view, partly in cross-section, through the mainframe and platenframe, showing the connections of one frame to theother; the case-shifting mechanism; and parts of the letter-feed andother mechanisms.

Fig. 2 is a detail view in cross-section through one of the bearings bymeans of Fig. l is a view in cross-sectional elevation through theplaten guideways and supports,

v and. through one of the marginal paper fi'noftlie letter-feedescapement mechanism,

gersand associated partsrshowing also the margin alarm mechanism.

Fig. 8 s a view in rear elevation of such l'and back-spacing mechanism,as is on the feed-rollers platen frame.

Fig. 9 is a view in cross-section on the line 9-4) of Fig. 8.

. Fig. 10 is a top plan view, partly broken, showing the platen; itsbearings for letterfeed movement on the platen frame; the and theirpressure-rclieving mechanism; and other associated parts.

Fig. 11 is a view in front elevation, partly broken, of the parts shownin 10.: and also of the letter-feed escapemcnt and backspacingmechanisms.

Fig. 12 is a view in cross-sectional side elevation through the machine,showing the letter-feed mechanism and the control of the same from thetype and space keys; and showing also the feed-roller shifting mechanism the adjustable paper fingers; the type bars; and otherparts.

Fig. 13 is a broken view in side elevation showing the connections ofthe platen frame to the main frame; indicating the throw of the platento upper-case position; the drum; and parts of the letter-feedescapement and feed-roller shifting mechanisms.

Fig.11 is a view in front elevation of the right hand adjustablemarginal paper finger and associated, parts.

Fig. 15 is a view in side elevation of one of the ribbon feedingmechanisms and operating connections therefor to the universal bar.

16 is a viewin side elevation of the raeaoes mounted on the main frame,and'has side plates 31 of sheet metal on the main frame, and has sideplates 20 0f sheet metal, cut out at 21, Figs. 4: and 13. The plates 20,at the rear thereof, are turned inward to form cars 23; and forward ofthe ears 23, the plates 20 have ears 21 struck inward therefrom. To thecars 23 and 24, respectively, are secured cross plates 25 and 26, theupper edges of which are offset at 27 and 28 to form grooves or tracksfor balls on which the platen 29 or carriage has letter-feed and returnmovement. The platen is revolubly mounted at 30 on plates 31, one ateach end thereof; and the plates 31 are connected by angle pieces and33, between which and the offsets 27 and 28, are held the balls 31 and35. There are two balls between the offsets 28 and the plate 33, and oneball 34 between the 05- set 27 and the plate 32. The balls 35 areheldagainst longitudinal displacement by a strip of metal 36, (see Figs.10 and 12), which is between the offset 28 and the plate 33, and whichis perforated to embrace the balls loosely. This piece of metal 36 hascentrally thereof a finger 37 which passes over the plates 32 and 33,and is turned down between the plate 32 and offset 27 at which point itis perforated to embrace loosely the ball 3%.

The plates 31, in which the platen is journaled, also carry a rack 38which is in mesh with a pinion 39 to control the letter-feed movement ofthe platen. The rack 38 is pivoted at 10 to the plates 31, so that, bymeans of a handle 4:1, (see Fig. 9), secured to the rack, the rack maybe swung out of mesh with pinion 39, to permit movement of the platenfree of the escapement mechanism. Letter-feed movement of the platen iseffected by means of a cord 42 connected at 43, (see Figs-5 and 6) toone of the plates 31, andat its other end connected to the casing 11 ofa spring drum, the spring 15 of which is connected on the one hand tothe casing 44, and on the other hand to a sleeve $6 on a stud l'l'. Thestud 47 is carried by the crossplate 26 of the platen frame, and thesleeve 46, which is adapted to be turned thereon in adjusting thetension. of the spring, has bearing in a sleeve 48 fast to thecross-plate 25 ofthe platen frame. The end of the sleeve 16 .is threadedto receive a toothed wheel a9 and a lock nut 50. A strap 51 secured byscrews 52 to the plate carries an escapement dog 53 in engagement withthe wheel 49, to hold the latter, and when rocked to permit of step bystep movement of the spring drum to relieve the ten sion of the latter.

The cross plates 25 and 26 of the platen frame also carry the escapementmechanism which controls the letter-feed drive of the platen. Thismechanism, (see Figs. 8, 9, and 11), comprises a ratchet wheel 54 on ahub 55, to which the pinion 39 is secured. This hub is mounted to rotateon a pin 56, one end of which has a bearing 57 on the plate 26, and theother end of which has a bearing 58 on the plate 25. Engaging theratchet wheel'is a dog 59, pivoted at..60 to a plate 61 which is adaptedto be rocked on trunnions 62 on ears-63 secured to the plate 25. Aspring 64 (see Fig. 1), attached at one end to the plate 25, and bearingat the other end against .the rocker 61, holds the latter to a stop 65,with the dog 59 in engagement with the ratchet wheel, and returns thedog to the ratchet Wheel after each type stroke. An arm 66 passesthrough a slot 67 in the plate 61, and carries a nut 68, which, when thearm 66 is moved forward at type strokes engages the plate 61 to rock thesame on its trunnions. The arm 66 is carried by a draw-bar or link 69which has a floating support at 70 on an arm' 71 pivoted to a bracket 72on a cross piece 73 of the main frame.

The link 69 is vibrated at type strokes by the following connectionsfrom' the type keys 75. Each type key lever 76 is fillcrumed at-its rearend on a blade 77. To hold the key lever to its fulcrum, a finger 78 onthe lever has attached thereto one end of a spring 79, the other end ofwhich is, also attached to the lever near the rear end of the latter.The spring is bent over,

and bears on, a curved plate 80, and thus exerts an upward pressure onthe lever to hold the lever to the blade 77, and to return the lever tonormal position after each operation thereof. Each key lever works in aslot in the front plate 16 of the main frame, and the upper and lowerwalls of the slot determine the normal position and throw of the lever.Each key lever has a shoulder 81 adapted to strike and depress auniversal bar 82 pivoted at its rear ends to brackets 83 secured to thecross piece 73. Attached at 84 to the universal bar is a link 85, theother end of which connects to an arm 86 fast to a rock-shaft 87journaled in brackets 87 secured to the cross piece 73 of the mainframe. Also fast to the shaft 87 is an arm 88, the upper end of whichcarriesa pin 89 in a slot 90 in the drawbar or link 69 which vibratesthe escape ment rocker 61. Depression of a type key moves the arm 88until the pin 89 reaches the forward end of the slot 90, and thereaftermoves the link 69. The key-levers are made of considerable length, whichis a desideratum, and yet compactness is secured by having the rear endsof the levers ex:

tend beneath the forward'carriage track 28. The space-key 91 is carriedby a lever 92 fast to a rock-shaft 93, to which is also fast an arm' 9-1having attached thereto a link 95, the rear end of which is offset tolie within a slot 96 in the arm 71 to which the e'scapement draw-bar 69is connected.

link 95, and with it the arm 66 which operates the escapement rocker 61.A spring 92*" returns the space-key and link 95 to-normal position whenthe key is released. Thespring 64 acting on the rocker 61' returns thearm 71 and link 69 to normal position,"and after each type stroke, aspring 69 connecting the link 69 to the lever 88 returns the latter, andwith it the universal bar, to a normal position determined by the endwall of the slot in the link 69.

At each operation of a type key, or of the space-key, the dog 59 isthrown backward out of the ratchet wheel and another dog 97 fixed on therocker 61, is brought into the ratchet wheel temporarily to hold thelatter.

As soon as the dog 59 is released from the joint action throw the dogposition shown in Fig. 8. vents such throw of the dog as would-carryratchet wheel, springs 98 and 99, each at; I I

tached at one end to the plate 61 and at the other end to a tail 100 onthe dog 59, by their. 59 tothe-dOtted. Spring 99. pre-' it'out of reachof the ratchet Wheel. Oh

release of the type key, the spring 64 throws the dog 97 out of theratchet wheel, and causes the dog 59 again to enter the same, this time,however. behind the tooth "previ ously held by it, so that the wheel,under the I action of the spring drum advances a step,

before it and the dog 59 are stopped by' engagement of the latter with astop 101 on the rocker 61. The rocker 61 at the. part thereof engaged bythe arm 66 is inclined. (see Fig. 12) in the direction in which theplaten is shifted between case-positions, so

thatin all case-positions the rocker receives v the same amount ofmovement when vibrated. The slot 67 allows for the caseshift.

A back-spacer is also carried by the platen frame. (see Figs. 8,9 and11). The backspacing key 102 is on a' lever 103 pivoted at 104 to abracket 105 on a cross piece 106 of the main frame. The lever '103, whenrocked, engages one arm 107 of a bell-crank let er 108 pivoted on abracket 109, also on I the main frame, and rocks the bell-crank againstthe action of a spring 110-. The other arm 111 of the bell-crankconnectsby a link 1121p an arm 113 loose on the pin 56 Y dog 111- cooperates\viththe guardfllfi for this purposellz- When depression of theloackspacing keylOQ moves the link '112, theann 113 is. swung down,alway-from the guard 116. When so moved a suflicient distance, the dog111 is forced by the spring 115 into engagement with the wheel 54;, andfurther movement of the arm 11?) causes the wheel 5 t to be turned backone step. 1n this oper ation; the dog 59 is cammed up by the toothbelowit on a ratchet wheel, and then snaps back into place below that tooth istop 118- on the plate of. the platen frame; (see; Fig. 11). determinestl1'e"tl11 'o\v ofthehp arts" in back-spacing direction. Then thebacle', space key 18 released the spring 11( returns 'itand thedogcarrying arm 113 to Fig.8-

position. The teeth fofjthe wheel o l 'areso shapeda-s to cause thedogz11-1 tobecammed.

outhof tliewheel in this return movement; and. the'dog is finally held-out'of the wheel by the guard. 116. The back-spacingconnectionsareinaintained in all case-positions of theplatenlrame,because-a shift of the-,- platen frame merely changes the normalangularposition of the link 112, without affecting the back-spacing actionthereof.- Tl1e sbring'llO holds the bell-crank'- lever 108 to the keylever. and a slotted'plate 103 arrests thekey lever 103, and the partsactuated by spring 110, in' normal position. D

It has been stated that the platen frame, with the various parts carriedthereby, may

be moved onthe main frame between three casepositio ns. For this purposeit is con nected to the main frame. at each side of the machine, by twoarms or links 120 and 121.

.The aims or links 121 are straight arms,

pivotally secured at one end, at'122, to the lower rear part of theplates 19 of the main frame, and pivotally secured at the otherend. at123, to the lower front part of the plates 20 of the platen frame. Thearms or. links 120 are curved, to clear certain parts of the machine,and are pivota-lly secured atone end, by shouldered screws 12%. toupward projections 125 of the plates 19 of the main frame, and atthe'other end, at 126, to the upperforward part of the plates 20 of theplaten frame. The heads of said screws 121. may confine thecarriage-track frame 20, 25, 2T, 28 against lateral displacement.The'arms 120 and 1:21, while maintaining the connection of the frames.permit the platen frame to be lifted and lowered on the mainframe asindicated in Fig. 13, and also carries an arm or post which, when theshaftis rocked by the lever 139, is swung guide the platen frame in itsmovements. The arms 121 (see Figs, 2 and are not directly pivoted to theframe plates 19, but

are fastjto a sleeve 127 which is journaled ongudgeons 1:28 carried byblocks 129, secured by screws 130 to the frame plates 19.

'Each gudgeon. has a key or lug 131 fitted in a recess or slot in itssupportingblock,

and a's crew 132holds the gudgeons to the block. The gudgeons havereduced ends 133 to receive a piece of tubing 13-1, wlnclnby bearingagainst the shoulders 135,. prevent the blocks 129 and the frame members19 in Fig. 4 the parts are shown in lowerease position. For shifting theplaten frame to upper case position there is a key 136, and for shiftingthe platen-frame-to middlecase position there is a key 137. The keylevers- 138 and 139 are pivoted at 140 on a standard: 111 secured to acrossbar 11 12 of the main frame. The lever 138 of the uppercase key hasan arm 1 13 projecting rearward under :1- lug or offset 144 on the-leftside plateQO of the platen frame. Then the key is-depressetl, its leverengages this-lug and thereby lifts the platen frame. For determining thethrow of the platenv frame -when i t'is so lifted, the side plat QO' hasfixed thereon another lugor offset 'l'4c5having a hole 116 therethrough.A -post'117 secured at 118'to the main-frame passes through the ho1e146,and is threaded at 'its upper end to receive stop and lock nuts 149 and149, whiclrwhen the platen frame .is lifted sutiicientfdistance;areengaged by the his 115 to determine the uppercase position oftheplatemfra'me. The-post 14:7 is

also threadedht its lower part to receive stop and lock nuts 150 and 150for determining the normal or lower-case position of the platen frame.'Bothset's of nuts are adjustable along the post so that the easeposition may be accurately. determined and by means of the latter,the,platenframe may be lifted. when key 137 is dep' ressedj The lever139, however, has at its end al'ajt'eral offset or tooth 151 adapted;when the key 13? is depressed. to engage an arm 152011 a rock-shaft 153which bears in the side plates" 19 of the mainframe. The shaft is shownas av flat bar having its ends. offset.-

and perforated to receive screws 154:, which protrude from the sideplates 19,. and serve as'bearine's for the shaft; This-shaftaction ofthe shift keys.

158. throws the stop 156 and rock-shaft 153 to normal position,determined by a stop pin 159 on the main frame, as soon as the key 137is released. The adjustability of the stop- 156 provides for accuratedetermination of the middle-case position, and for re-setting thereofwhen desired. Springs 160 attached atone end to fingers' 161 on the arm120, and at the other end to the main frame plate 19, assist in theshifting operation, and thereby provide for a light Springs 162 and 163,each attached at one end to its respective shift key lever, and at theother end to a lug 164 on the main frame, return the keys to normalposition when the same are released.

For locking the keys and platen frame in the case-position to which theyhave been moved, there is pivoted at 165 on a standard 166, secured to across piece 167 of the main fram a. lever 168, the upper end ofwhichcarries a finger piece 169, and the lower end of which carries a tooth170. Each of the shift-key levers has on its under edge a tooth ordetent 171,which, when the key is operated, is brought to a positionsuch that the tooth 170 on the lock-lever 168 may be swung over thetooth 171 on the depressed shift lever, as shown in dotted lines in Fig.4, thus preventing a return of the shifted parts when the finger isremoved from the shift key.

The ribbon is fed at type strokes from one to the other of the spools175, which are carried in cups 175 attached to ears 17 5 on the sideplates 20 of the shiftable platen frame.

Fast to the shaft 87, at each side of the ma: chine, is an arm 176connected by a link 17 7 to a lever 178 pivoted at 179 at anintermediate point thereof on a bracket secured to the adjacent sideplate 20' of the platen frame. The upper end of each lever 17 8 isturned horizontally, and is forked to engage a pin 181 depending from anarm 182 loose on the spool shaft 183. The spool shaft 18 held fixedly ina bracket 184 on the side plate 20 of the platen frame. The arm 182 haspivoted to its outer end a dog or pawl 185, resiliently'held by a spring186 in engagement with a toothed wheel 187 fast to a hub 188 adapted tobe turned on thespool shaft. Also fast to the-hub 188 isa collar 189carrying a pin 190 adapted to be interlocked with the'spool 17 5 whenthe latter is slipped down over the shaft 183. At each type stroke thearm 182, with the dog 185, is vibrated; and the tooth of the.dog is soadapted that, as it is rocked in one direction, it carries the toothedwheel 187 and spool with it, whereas as it rocks in the other direction,the dog is camnied out of the wheel and'rides idly over the same. Aspring dog 191 holds the toothed wheel against accidental displacement.Each spool 175 has its independent feeding connections from theuniversal bar, but the dogs 185 at the two spools drivev in oppositedirections, and only one dog at a time is effective. Any suitablesetting mechanism such, for instance, as shown in my co-pendingapplication for United States Letters Patent, Serial No. 53,220, filedSeptember 30, 1915, (now Patent No. 1,249,022,'dated December 4, 1917),may

one of the spools in ineffective position while the ribbon feed is beingeffected by the other spool. The connections from the type keys to thespools are maintained in all case-positions of the platen frame,because, although the shifting of the frame lifts the levers 178, itdoes not break the connections of the same to the universal bar. Theshift causes the levers 178 to change their angular position, but thismerely causes the dog 185 to move to another set-position on the toothedwheels, after which they operate as before.

The ribbon vibrating mechanism, (see Figs. 16 and 18),comprises a link192 which connects one of the levers 178 to an arm 193 pivotally mountedon a bracket 194 attached to the cross plate 26 of the platen frame.

. The arm 193 has pivotally connected thereto,

a link 195, the other end of which is hooked into a ribbon carrying andvibrating arm 196, pivoted to a bracket 197 on one of the side plates 20of the platen frame. The ribbon is threaded through a slot 196 in thecarrier 196 just to the left of the printing point. As the arm 193 isrocked up and I down at type strokes by the lever 178, the

tion to another results in a corresponding angular shift of the arm 193to a new setting, but this does not affect the vibration of the ribboncarrier at type strokes. The slot 90 in the link 69 permits the fullstroke of the universal bar to be employed in vibrating the'ribbon,While only the final part of the stroke of the universal bar is employedin operating the carriage escapementp The type bars 200 are pivoted to asegment 201 carried by the main frame; and each is connected by a link202 to a bellcrank lever 203, one arm 20% of which isslotted at 205 tobe engaged by a pin 205 on the proper type-key lever 76. Each bellcrank203 is pivotally mounted on a standard206, and the standards 206 are allsecured to the cross piece 142 of the main frame. The type actions forcompactness are mounted between the side plates 20 of the shiftablecarriagetrack frame. Near the printing point, tothe right thereof, is aspring clip 207 secured at 208 to the cross piece 26 of the platenframe. The clip 20? on a shaft 213. The shaft 213 is carried by arms 214loose on a shaft 214 journaled on the plates 31 which carry the platen.

Integral with the arms 214is a plate having a blade-shaped part 215forward of the feed rollers -212,'to serve as apaper guide, and

a plate 216 which is-curved around the rollers and termlnates in astraight; edgeat the rear thereof. The arms-21st are preferably struckfrom the sheet material of which this plate is formed. Also struck fromthe blade portion 215 of the plate at. each end thereof, is an ear 217to which is secured one end of a spring 218, the other end of which isattached to an ear 219 on the adjacent plat-e31.

The springs 218 hold the feed rollers resili-.

ently to the platen. fFor relieving the pressure of the feed rollers onthe platen, there is a finger piece 220 on an arm 221 fixed to the shaft214?. Also fixed to the shaft 21%, near each end thereof, is an arm222,- the end of which overlies the rear edge of the plate 216, on whichthe feed rollers are carried. A, forward pull on the finger piece 220causes the arms 222-.t'o swing downward,

and by engaging the plate 216, to move the latter with the feed rollersawayfrom the platen against the-action of the springs 213.]

When the finger piece 220 is '1'eleased,.tl1e springs 218 return theparts to normalposition, determined by contact of the rollers with theplaten. The arms 221 and 222 are held in normal position, againstbackward moverrienhyby engagement of the arms 222 with the paper shelf210. Spring clips 223 serve as fingers for holding the paper at themargin there-of. As

shown in Fig. H, these are of inverted Y-shape with a finger piece 22%at the upper end. Each clip is carried by a plate (see Fig. 7), which isslida-ble along on the scale plate 226 to any adjusted position thereon.The scale plate is carried 'by'a narrower bar 227, in turn secured tothe plates 31 in which the platen is journaled. To secure the carrier225 against all but sliding movement on the scale plate, the carrier hastwo supporting fingers 228 which lie against the face of the scale and.are crimped over the top edge of the latter. The carrier is also turnedunder the scale, and has an offset 229, Fig. 7, behind the lower edge ofthe same. The carrier 18.

locked to the scale by means of a tooth 23.0, {see Figs. 12 .and let),on a piece 231 which connectsthe lower branches of the paper fingers. Inlooking the carrier, the tooth 230 cooperates with the teeth of arack232on the lower edge of the scale. In order that the tooth 230 may engageand disengage the rack, the piece 231, with th clips 223, is movable upand down on the carrier The clip piece 231 is turned under the carrier(see Fig. 12), and there has an opening therein, through which passes afinger 233 on the carrier. The finger 233 serves as a support for a coilspring 23 1, the upper end of which bears against the clip plate 231,and is held in place by a projection 235 on the latter. This springholds "the clip plate up against its carrier, with the tooth 230 in'therack. Depression of the clip against the action of the spring 234,disengages th toothifrom the rack;- and, when so depressed, the clipwith its carrier may he slid along the rack. Pins 236 on the carrierpass through openings 237 in the clip piece 231, and are of'such lengthas always to lock the clip to the carrier for longitudinal movement ofthe' two together. The pins 236 also serve to guide the clip in itsrack-engaging and disengaging movements. In order that when the clip isdepressed, it may be slid with the carrier, and at the same time helddepressed, by a simple pull or push 011 the clip longitudinally of thescale, the pins 236 are suiiiciently loose in the holes 237 to permitthe clip to be tilted, when the tooth 230 is out of the rack, until thepart 231 thereof binds with theearrier at such an angle thereto thatmaintained downward pressure on the clip is not necessary to keep thetooth from the rack I during the sliding operation. An index piece 238.on the clip registers with the markings on the scale for determiningthe setting of the clip.

0n the-plate 26 of the platen frame is a margin alarm or bell 240. Theclapper 241 of the bell is on a pin 2&2 supported by a cioilspring whichat its other end is supported on a pm 244 on the cross plate 25 of theplaten frame. The clapper pin 211:2 pr0- jects through opening 24:5 inthe cross plate 26 of the platen frame, and lies in the path of afinger" 246 on the carrier 225 of the right hand paper finger. When theletterfeed movement of the platen brings the finger 246 to the bellclapper, the alarm is sounded. The time of sounding of the alarm istherefore dependent upon the ad-' justment of the paper finger, and anindependent setting of the alarm is unnecessary. Variations may beresorted to within the scope of the invention, and portions. of theimprovements may be used without others. Having thus described myinvention, I claim: I

. 1. In a typewriting machine, a main frame, a carriage-track framehaving forward side-extensions and shiftable between threecase-positions on the main frame, stops at both sides of the mam frameto engage said extensions for determining saidcase-positions, includingmovable stops for determining intermediate caseshift positions, meansfor shifting the carriage-track frame from one to another case-position,and means controlled by said shifting means for moving the stops for theintermediate case-position simultaneously from normally ineffectivepositions to effective positions when the carriage-track frame isshifted to the intermediate case-position. 7

2. In a typewriting machine, a main frame, a carriage-track frame havingforward side-extensions and shiftable between three case-positions onthe main frame, and

stops at both sides'of the main frame to engage said extensions fordetermining said case-positions, the stops for upper and lowercase-positions being fixed, and the stops for intermediate case-positionconnected to shift together from ineffective to effective position.

In a typewriting machine, a main frame, a frame hiftable between threecasepositions on the main frame stops on both sides of the main framefor determining said case-positions, the stops for the upper and lowercase-positions being fixed, and the stops for the intermediatecase-position being carried by arms connected to be simultaneouslyrocked to move the stops thereon between ineffective and effectivepositions,

means for shifting the shiftable frame from one to anothercase-position, and means controlled by said shifting means for movingsaid intermediate stops to effective position when the shiftable frameis shifted to intermediate case-position.

4:. In a typewriting machine, a main frame, a frame shiftable betweenthree casepositions on the main frame, sets of stops for determiningsaid case-positions, including intermediate shift-stops at the sides ofthe machine, means for shlfting the shiftable frame from one to anothercase-position, and means for moving the stops for the intermediatecase-position simultaneously from normally ineffective positions toeffective positions when the shiftable frame on the carriage-trackframe, posts on the sides of the main frame and each having a nutthreaded thereon to be set in adjusted position thereon, said nutsprojecting into the paths of said lugs, whereby when the carriage-trackframe is shifted the lugs will strike the nuts and thecarriage-trackframe be thereby accurately arrested at both sides thereofin desired case-position, and means for shifting the carriage-trackframe from one to another case-position.

6. In a typewriting machine, a main frame, a frame shiftable betweenthree casepositions on the main frame, two fixed stops on each side ofthe main frame, lugs on the sides of the shiftable frame to be moved bythe latter from one to the other of said stops determine theintermediate case-position of the shiftable frame, a key for throwingthe shiftable frame from lower to upper caseposition, and a second keyfor moving said intermediate stops simultaneously to effectivepositions, and for throwing the shiftable frame to intermediatecase-position, determined by said movable stops.

7. In a typewriting machine, a main frame, a frame shiftable betweencase positions on the main frame, a key-lever for shifting the shiftableframe, a. transverse rock-shaft, arm fast to the opposite ends of therock-shaft, means for rocking said arms and shaft from the key-leverwhen the latter is operated to shift the shiftable frame, and stopscarried by said arms for determining the throw of the shiftable framewhen'the latter is shifted by the key-lever, saidstops being moved bythe rock shaft from normally ineffective positions to effectivepositions when the key-lever is operated.

8. In a typewriting machine, a main frame, a' platen frame shiftablebetween case-positions on the main frame, a keylever for shifting theplaten'frame, a rockshaft, an arm fast to the rock-shaft, meansforrocking said arm and shaft from the key-lever when the latter isoperated to shift the platen frame, a second arm on said" shaft havinarstop thereon movable by the rock-shaft from ineffective to effectiveposition to determine one -ase-position of the platen frame when thekev-lever is operated, a second key-lever for shit ing the platen frame,and. a second stop for determining another case-position of the platenframe when said second key-lever is operated.

.9. In a .typewriting machine, a main frame, a platen frame sliiftablebetween case-positions on the main frame, a keylever for shiftingthe'platen frame, a rocl shaftfan arm fast to the rock-shaft,.means forrocking said arm and shaft from the key-lever when the latter isoperated to shift the platen frame, a stop carried by said shaftfordetermining the throw of the platen frame when the latter is shifted bytheike lever, said stop being moved by the rockshaft from a normallyineffective position to effective position when the key-lever isoperated, and a spring for returning the stop to ineffective positionwhen the keylever is released;

'10. In a typewriting machine, a main frame having side plates, a platenframe shiftable between case-positions on the main frame, arms or links,one at each side of the machine,.each attached at one end to the platenframe and at the other endpivot-ally connected to the main frame, forholding and guiding the platen frame, a sleeve to each end. of which oneof said armsis secured, a spacing block between each of the arms andtheadjacent side plate of the main frame, and gudgeons, one held to each ofsaid blocks,.to serve as bearings on which the sleeve rocks with thearms when the platen. frame is shifted.

11'. In :a ty-pewriting machine, a main frame; having sheet metal sideplates, a platen frame shiftable between case-positions on the mainframe, arms or'links, one at each side of the machine, each attached atone end to the platen frame and at the other end pivotally connected tothe main frame, for holding and guiding the platen frame, asleeve toeach end of which one' of said arms is seemed, .gudgeons on the sideplates of the main frame to serve as hearings on. which the sleeve rockswith the arms when the platen frame is shifted, said gudgeonsbeingshouldered within the sleeve,

and a tube supported on the gudgeons with the, ends thereof against saidshoulders to prevent interference of the side plates of the main framewith said arms.

12. In combination, a shiftable carriagetrack frame comprising a rearplate, a portion whereof forms a carriage-track, side plates fixed attheir rear portions to said rear plate, said side plates having forwardextensions to carry ribbon-spools, a rigid connection between said sideplates between their front and rear portions, said connection comprisinga carriage-track, and links whereon said frame is guided up and down,

said links pivoted to said side plates.

13. In combination, a shiftable frameeomprising a rear plate, a portionwhereof forms a-carriage}track, forwardly-extending side plates, aconnection between said side plates forming a companion track, saidplates being extended forwardly and upw'ardly in front of said companioncarrlage- {plates Lbeing extended forwardly and upwardly in front ofsaid companion carnage track to carry ribbon spools, a transverse rockshaft below-said shiftable frame, arms or links extending for -ardlyfrom said rock shaft and pivoted at their forward ends to said sideplates, and a pair of guide links pivoted at their rear ends to themachine frame and extending forwardly to the upper portions of said sideplates and pivoted thereto, said guide links carried downwardly at theirrear portions to occupy positions below the carriage tracks.

15. In combination, an up-and-down shiftable frame comprising a rearplate, a portion whereof forms a carriage track, side plates extendingforwardly from said rear plate, a companion carriage-track joining saidside plates, said side'plates having forward and upward extensions tocarry ribbon spools, upper and lower guide links upon which saidshifta-ble frame is mounted and whereby it is guided, and type actionsmounted between-said side plates.

16. In combination, an up-and-down shiftable frame comprising a rearplate, a portion whereof forms a carriage track,.s ide plate-s extendingforwardlv from said rear plate, a companion carriage-track joining saidside plates, said .side plates having for-" ward and upward extensionsto carry ribbon spools, upper and lower guide links upon which saidshifta'ble frame is mounted and whereby it is guided, and type actionsmounted between said side plates and comprising key-levers extendingrearwardly beneath said companion track.

17. In a typewriting machine, the combination with a main frame, of ashift-frame including a traveling carriage and tracks on which thecarriage runs, a bracket on said shift-frame, a, post embraced-by anopening in said bracket, stops on said post adapted to limit the throwof the shift-frame, so that: the: post forms a connection between themain frame and the shift-frame, and a holding means eoi'nprising ascrew-thread adapted to be unscrewed to break the connection between theshift-frame and the main frame.

18. In a typewriting machine, the combination with a main frame, of ashift-frame including a travelingcarriage and tracks on which thecarriage runs, a bracket on said shift-frame, a post embraced by anopening in said bracket, stops on said post adapted to limit the throwof the shift-frame, so that the post forms a connection between the mainframe an-d the shift-frame, a holding means comprising a screw-threadadapt- .ed to be unscrewed to break the connection between theshift-frame and the main frame,

a separate stop for arresting said shiftframe at an intermediate point,a shift-key adapted to determine whether said second stop shall beineffective or effective to arrest adapted to limit the throw of theshift frame, so that the post forms a connection between the main frameand the shift-frame, a holding means comprising a screw-thread adaptedto be unscrewed to break the connection between the shift-frame and themain frame, links pivoted on themain frame forguiding the shift-frame,and removable screw-pivots by which said links are pivoted to theshift-frame.

20. In a typewriting machine, the combination with a main frame, of ashift-frame including a traveling carriage and tracks .on which thecarriage runs, a bracket on said shift-frame, a post embraced by openingin said bracket, stops on said part adapted to limit the throw of theshiftframe, so that the post forms a connection between the main frameand the shiftframe, a holding means comprising a screw-thread adapted tobe unscrewed to break the connection between the shiftframe and the mainframe, a separate stop for arresting said shift-frame at an intermediatepoint, a shift-key adapted to determine whether said second stop shallbe ineffective or effective to-arrest the shift- .frame at anintermediate point, a second shift-key adapted to shift the shift-framethe full limit between the first-named stops,

shift-levers for said shift-keys normally clear of the shift-frame, sothat the shiftframe can be removed without disturbing theshift-key-levers, links pivoted .on the main frame for guiding theshift-frame, and

removable screw-pivots by which said links are pivoted to theshift-frame.

FRANCIS O. BURRIDGE,

Emecutor 0f the last will and testament of v Lee/S. Burridge, deceased.

Witnesses:

W. O. WESTPHAL, ARTHUR A. JOHNSON.

